Re: [CAD_CAM_EDM_DRO] Re: Extrusion sizes

Dave,
Your capturing my concept ! I recognized that you "hit it" when you mentioned
that you could use the "same" raw components for the slides AND the stands.
Excellent. This is my Idea. But, I see it a challenge without finding the
right extrusion ( and I prefer the typical T-slot ones). Thats why I feel
this is more a matter for an extrusion company to run with than for anyone to
make something. It becomes very clear that IF the right extrusions were
readily available off the shelf, there would be very little to "make". I can
find off the shelf liners and bushings to take up space.

Open bearings ?? Well, I see that could work very well too. I prefer to use
those low profile steel stands from thomson but even they are pricey. So,
next, one needs to find a really cheap but adequate "Stand" for the
predrilled rails. Thats why I'd start with closed options..................

As far as extrusions go, they are excellent to work and build with. There are
limitiations as one may expect but overall they are just downright versatile.
One limitation is the plain old application of "mass". It gets a little
difficult to add mass via extrusion use but you can take the "ring" out of it
by pouring empty ones full of concrete! In regards other uses.... There are a
million of them.

But it does beat trying to weld steel together without it moving all over the
place depending on which side your welding on. Some guys are better at this
than others. Extrusions just require a square cut end and you are set. Also,
I don't have to prime and paint them as you do the Steelwork.

Chris L

dave_ace_me wrote:

> Hi Smoke,
>
> I agree with your additional questions, but the reason I left them
> out is that for a cheap closed part, one could easily sawcut it to
> the opening desired. This would reduce costs of supply and offer the
> end user the chance to modify as needed.
>
> I had also thought that if say 1" was the bearing size and 3/4 the
> shaft size (pick any sizes you want) a simple steel, press fit sleeve
> would allow the sized (larger) hole to be used as an end support,
> again reducing parts counts and keeping costs low.
>
> great idea about other uses. bearings ? stepper mounts ? leadscrews ?
> pen holder ? electric motor bearings could easily and cheaply be
> used to make a jackshaft, or spindle.
>
> Also if everyone on the list replied... think I should make this a
> poll ? (Bill, looking for your input here too.)
>
> --- In CAD_CAM_EDM_DRO@y..., "Smoke" <smoke@t...> wrote:
> > Other questions would be:
> >
> > Do you want full length or intermittent support for the shafts
> (requires
> > open bearings)
> >
> > Do you want just support on the ends of the shafts?
> >
> > Can you use short sections of extrusions elsewhere in the design?
> >
> > > The questions to the group are:
> > >
> > > What shaft size are you looking for ?
> > > ball slide or plastic ?
> > >
> > > how many would you use in a year ?
> > >
> > > In a typical application, it might be 4 for each table, or 12 for
> a
> > > set-up. it might be 4 more for each to hold each rail end?
> > >
> > > Dave
>
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